Thank you for your post.
Bento for iPhone syncs with Bento for Mac, but it can also be a standalone product. Bento for Mac will import text files, Excel and Number files. It will NOT import FileMaker Pro files directly.
The link from "davidanders" is good (Thank you!). I would point out two specific links:
This shows how to get FileMaker Pro data onto an iPhone using PHP.
http://www.fmtouch.com/This is a third-party product that several forum members have mentioned (although I have never used) that puts your FileMaker Pro database on an iPhone.